Chemical heat storage is a promising technology for improving thermal energy efficiency. In this study, CaCl<sub>2</sub> and H<sub>2</sub>O were selected as a reaction system for utilization of...Chemical heat storage is a promising technology for improving thermal energy efficiency. In this study, CaCl<sub>2</sub> and H<sub>2</sub>O were selected as a reaction system for utilization of low-grade exhaust heat that is cooler than 200<span style="white-space:nowrap;"><span style="white-space:nowrap;">°</span></span>C. Heat discharging and charging were conducted through the CaCl<sub>2</sub> hydration reaction. A silicon carbide honeycomb was adopted to improve heat transfer in the CaCl<sub>2</sub> packed bed. The heat storage, condenser, and evaporator temperature were set at 150<span style="white-space:nowrap;">°</span>C, 30<span style="white-space:nowrap;">°</span>C and 90<span style="white-space:nowrap;">°</span>C respectively. Repeated trials and experiments are time consuming for optimizing design of the equipment. Therefore, in this research, we constructed a simulation that can predict the performance of the device. A numerical simulation model was utilized in preparation for the design of the heat storage module. The consistency of both the simulation and the experimental results was confirmed by comparing them.展开更多
We herein evaluate the use of a chemical heat pump (CHP) for upgrading waste heat. CaCl<sub>2</sub> was used in the system of CHP. We evaluated the heat storage and heat releasing of CHP, and confirmed the...We herein evaluate the use of a chemical heat pump (CHP) for upgrading waste heat. CaCl<sub>2</sub> was used in the system of CHP. We evaluated the heat storage and heat releasing of CHP, and confirmed the practicality from the experimental results. The reactor module employed was an aluminum plate-tube heat exchanger with corrugated fins, and the CaCl<sub>2</sub> powder was in the form of a packed bed. Heat storage operation and heat dissipation operation are performed at the same time and supplied to the heat demand destination. At this time, an environmental heat source can be used during the heat radiation operation, and the heat output can release more heat than the heat input during heat storage. The heat discharging and charging characteristics of the reactor module were evaluated experimentally. The coefficient of performance (COP) was calculated for the heat upgrading cycle, and the heat output in the system was determined. A COP of 1.42 and output of 650 W/L, based on the heat exchanger volume, were obtained using a 600 s change time for the heat pump.展开更多
文摘Chemical heat storage is a promising technology for improving thermal energy efficiency. In this study, CaCl<sub>2</sub> and H<sub>2</sub>O were selected as a reaction system for utilization of low-grade exhaust heat that is cooler than 200<span style="white-space:nowrap;"><span style="white-space:nowrap;">°</span></span>C. Heat discharging and charging were conducted through the CaCl<sub>2</sub> hydration reaction. A silicon carbide honeycomb was adopted to improve heat transfer in the CaCl<sub>2</sub> packed bed. The heat storage, condenser, and evaporator temperature were set at 150<span style="white-space:nowrap;">°</span>C, 30<span style="white-space:nowrap;">°</span>C and 90<span style="white-space:nowrap;">°</span>C respectively. Repeated trials and experiments are time consuming for optimizing design of the equipment. Therefore, in this research, we constructed a simulation that can predict the performance of the device. A numerical simulation model was utilized in preparation for the design of the heat storage module. The consistency of both the simulation and the experimental results was confirmed by comparing them.
文摘We herein evaluate the use of a chemical heat pump (CHP) for upgrading waste heat. CaCl<sub>2</sub> was used in the system of CHP. We evaluated the heat storage and heat releasing of CHP, and confirmed the practicality from the experimental results. The reactor module employed was an aluminum plate-tube heat exchanger with corrugated fins, and the CaCl<sub>2</sub> powder was in the form of a packed bed. Heat storage operation and heat dissipation operation are performed at the same time and supplied to the heat demand destination. At this time, an environmental heat source can be used during the heat radiation operation, and the heat output can release more heat than the heat input during heat storage. The heat discharging and charging characteristics of the reactor module were evaluated experimentally. The coefficient of performance (COP) was calculated for the heat upgrading cycle, and the heat output in the system was determined. A COP of 1.42 and output of 650 W/L, based on the heat exchanger volume, were obtained using a 600 s change time for the heat pump.
